Vania



(No Model.)

L. E. CUSTER.

POLISHING DISK POR DBNTISTS.

No. 387,581. Patented Aug. '7, 1888.

WITNESSES: INVENTOR,

Q .7 5 5mi www? M LEVI TT E. OU STER,

OF DAYTON, OIIIO, ASSIGNOR TO TIIE S.

S. TVH ITE DENTAL liIANUFAOTURING COMPANY, OF PHILADELPHIA, PENNSYL-VANIA.

POLISHING-DISK FOR DENTISTS.

SPECIFICATION forming part of Letters Patent No, 387,581, dated August7, 1888.

Application filed March Q, 1988.

T 0 all whom it may concern.-

Bc it known that I, LEvi'r'r E. CUsTER, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Polishing-Disks forDentists; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

Abrading disks for dentists use, simple and composite,have been made;but a desideratum not heretofore attained has been to provide apolishing-disk which shall bethin and flexible, while sufficiently stifftodo the work required, and which shallhavea soft instead of an abradingor cutting polishing-surf'ace. Felt and other disks have been made witha soft polishing-surface, but they are too thick. (lomposite disks havealso been provided, but they have always a cutting or abrading surface.

I have attained the ends desired by devising a composite disk made of athin backing of' prepared paper or celluloid, or other suitable thin andflexible material of the required stiffness, and a softoperating-surfaeesuch as very thin chamois-leather, flock, felt, Yes--applied and firmly united thereto. This gives the required softpolishing surface, while the disk may be made very thin.

[have particularly set forth my claim at the close of thisspecificatior.

In the accompanying drawings, Figure lA is a view of my improved diskmounted on a mandrel ready for rotation and operation by the rotarychuck or tool-carrier of a dental engine. Fig. 2 is a View ofthe back,and Fig. 3 a view of the soft-surfaced operatingface of the disk. Figs.4 and 5 are sections through the composite material of which the disksare or may be made, the thickness of which is exaggerated, Fig. 4 beingsupposed to represent a celluloid backing or body with a chamois facing,and Fig. 5 a paper backing with a felt facing.

The material may be made in sheets and the disks then stamped or punchedout by a suitable cutter, after the fashion, for example, of a gun-wadpunch. This material may be a (No model.)

paper or parchment baeking,fc, and a chamoisleather or felt facing, b,to constitute the polishing-surface. The paper may be thin and flexible,while possessing the requisite stiffness to carry the soft facing to dothe work required and permit the entrance of the disk between theapproximate surfaces of the teeth to be polished. If paperis used, itshould be water-proofed by the use of shellac or in other well-knownways.

The chamois-leather, if used for the soft facing, is made very thin, andis applied to the paper and united thereto by a suitable cement, such asshellac, preferably under hydraulic pressure, so as to make a compositebody of the two, with the layers of paper and leather permanentlyadherent.

Instead of the soft-leather facing, the thin disks may be made of thepaper backing varnished with shellac or copal varnish,and when 7opartially dry have a soft facing added by shaking over the preparedpaper fine flock or felt, for instance, which adheres by the dryingofthe varnish, the loose particles being blown off.

If the thin carrying-body is to be, say, of thin celluloid, insteadofpaper, it is vai-nished with a solution of gum-camphor in alcohol tosoften the surface, and the thin layer of, say, chamois-leather, is thenapplied and the ma- 8o tcrial dried under pressure, so as to make thematerial permanently composite with a soft face. A like union of thecelluloid and leather may be effected by heat and pressure.

My object has been to produce a very thin polishingdisk for dentists,having a soft operating-surface, so that the dentist can put the highestAfinishing polish on gold or other fillings, especially such as occupyapproximate situations andare separated from oe the adjacent teeth by aspace too narrow to admit of any but a very thin disk, my disks beingusually not more than from one to two hundredths of an inch inthickness.

I do not claim an abrading or a cutting disk 9 5 having a surface ofsand-paper, emery, or similar abrading lnattcr impressed into thesurface of the disk; and I am aware that such composite disks haveheretofore been madethat is to say, with athin backing or carrying- Ioobody, an applied surface of paper, leather, or other material, and athird or :Lbruding or cutting surface of sand. emery, or other materialof that character. Such a disk is used for dental operations of anentirely diferent character from those to which my disk is fitted, mydisk being for the purpose of putting on the final finish :1nd polish bymeans of a soft surface.

I claim- A composite polishing-disk for dentists, Consisting of' a thincarrying-body and a soft Working surface thereon, such as chamoisleather, felt, &\c., substantially as described.

In testimony whereof I affix my signature in 15 presence of twoWitnesses.

LEVITT E. CUS'IER.

W'itnesses:

ALBERT KERN, HATTIE Ros'r.

